The idea is to get:
- * a sheltered sleeping area +
* a bit of shade +
* a shower
What's Required
- * a van
* a flat rectangle roughly the length/width of the roof of the ban. I envision this constructed from 2x4 and plywood.
* UV-shielding tarps (they're available, more expensive than regular tarp)
* a shower base (frame made from 2x6, lined w/tarp, with standing platform)
During the drive up, the rectangular thing is strapped to the van lengthwise, like so:

This would call for either some stiff rubber pads (van roofs are curved) and some heavy-duty cinch straps from home depot ( ~$40 for a pair).
Setting up
Just unstrap the top rectangular plank and swing it cross the van. Restrap with cinches, perhaps in a cris-cross pattern (it gets a little sketchy here, not sure about wind forces).
Line the top with tarp, attaching to the ground on each side like this:

The shower is on the more steeply sloped side. We're talking about a pretty minimalist shower here, just something to drizzle some water over your body. I envision taking a few two-gallon containers, and placing one on top of the wooden thing, over an appropriately cut hole in the plywood.
The other side of the van (with the longer slope) provides some shade for sitting in. Park the van so that the afternoon sun hits the shower side of the setup.

Sleep in the van. Since the roof of the van is mostly covered with reflective tarp, it (may) (theoretically) stay a bit cooler. You can run the AC for a bit to cool things off in a pinch.
Potential gotcha's
- * really need to strap that overhead rectangle down ... not sure how it will handle the wind.
* an evap pond would add a lot of complexity to something of this scale. I envision carefully returning the graywater to containers and hauling it out. And taking very short showers.
* unclear how comfortable it will be sleeping in a van on the playa
* tarps tend to fight with the wind ... it could be loud
A self-contained, compact setup for two providing a wind-proof sleeping area, some shade, and a shower!
That's it my friends. Comments / additional brainstorming welcome. If you'd like to play around with the 3d model, grab my sketchup file here
